You need a buffering substrate as well... Such as ADA Amazonia, SL-Aqua Soil, Fluval Shrimp Stratum, or any other buffering substrate.
Any GH+ remineralizer for shrimp would work fine for crystals. I've heard a lot of people raving about the SL-Aqua products and a few people also like Shrimp Nature.
Any GH+ remineralizer for shrimp would work fine for crystals. I've heard a lot of people raving about the SL-Aqua products and a few people also like Shrimp Nature.